Unit-2: Mobile computing lecture notes (Telecommunication Networks) P.R.Engineering college

Unit-2: Mobile computing lecture notes (Telecommunication Networks) in Mobile computing uploaded at P.R.Engineering college

Unit-2: Mobile computing lecture notes (Telecommunication Networks) in Mobile computing at P.R.Engineering college P.R.Engineering college Staff uploaded in lecturenotes.net

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Telecommunication
Networks
2. Global System for Mobile Communications
A digital cellular phone technology is based on TDMA. GSM was first deployed in seven 
European countries 1992.
It operates in the 900 MHz and 1.8 GHz bands in Europe and the 1.9 GHz PCS band in 
the U.S. Based on a circuit switched system that divides each 200 KHz channel into eight 25 kHz 
time slots, GSM defines the entire cellular system, not just the TDMA air interface. Its ubiquity 
makes international roaming very common between mobile phone operators, enabling 
subscribers to use their phones in many parts of the world GSM also pioneered (initiated) a low
cost alternative to voice calls, the SMS, which is now supported on other mobile standards on 
others mobile standard as well. Another advantage is that the standard includes one worldwide 
Emergency telephone number, 112.
Newer versions of the standard were backward- compatible with the original GSM
phones .Eg. The standard added packet (mail boat) data capabilities, by means of GPRS and 
Higher speed data transmission using Enhanced data Rate for GSM Evolution (EDGE)IT1403-MOBILE COMPUTING IV YEAR / VIII SEM
DEPARTMENT OF CSE 52 PREC
2.1 GSM
Goal: The goal of GSM is to provide a mobile phone system that allows users to roam 
throughout Europe and provide voice services compatible to ISDN and PSTN.
Generation:
GSM is in second generation
Replacing first generation analog systems doesn‟t offer the data rates as that of third 
generation systems.
Version:
(1) GSM 900: Initially deployed in Europe. Frequency offered is
1. Uplink 890 to 915 MHz
2. Dwonlink 935 to 960 MHz
(2) GSM 1800: otherwise called as Digital Cellular System DCS 1800 
1. Uplink -> 1710 to 1785 MHz
2. Downlink  1805 to 1880 MHz
(3) GSM 1900: Otherwise called as personal communication service PLS 1990 
1. Uplink -> 1850 to 1910 MHz
2. Downlink  1930 to 1990 MHz 
(4) GSM 400:
1. Uplink -> 450.4 to 478 MHz 
2. Downlink  460 to 496 MHz
(5) GSM Rail:
1. Used in European countries. 
2. Used for railroad system.
Features of GSM Rail:
(1) Offers 19 exclusive channels for voice and data traffic.
(2) Special features like emergency calls, voice group call service etc. are available. 
(3) Calls are prioritized (Assign a priority).
(4) Used to control the trains, switches, signals, gates.
2.2 Services Offered By GSM
GSM allows the integration of voice and data services and also the internet working with 
the existing networks.
Three types of services are offered by GSM viz.
(1) Bearer (holder) Services, (2) Tele services (3) Supplementary servicesIT1403-MOBILE COMPUTING IV

Title:
Unit-2: Mobile computing lecture notes (Telecommunication Networks)

Subject:
Mobile computing

Institute:
P.R.Engineering college

Unit-2: Mobile computing lecture notes (Telecommunication Networks) P.R.Engineering college

Unit-2: Mobile computing lecture notes (Telecommunication Networks) in Mobile computing uploaded at P.R.Engineering college

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